Add eMMC-enabled kernel for non-"lite" CM4 models

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        board: [pi2, pi3-64, pi4-64]
+        board: [pi2, pi3-64, pi4-64, cm4-64]
     steps:
     - uses: actions/checkout@v3
       with:
@@ -70,7 +70,13 @@ jobs:
         done
 
     - name: Build
-      run: make -j BOARD=${{ matrix.board }}
+      run: |
+        if [ "${{ matrix.board }}" == "cm4-64" ]; then
+          make -j BOARD=pi4-64 USE_EMMC=1
+          mv kernel8-rpi4.img kernel8-rpi4-emmc.img
+        else
+          make -j BOARD=${{ matrix.board }}
+        fi
 
     - name: Upload built kernel
       uses: actions/upload-artifact@v3
@@ -79,7 +85,14 @@ jobs:
         path: kernel*.img
 
     - name: Build (HDMI console)
-      run: make clean && make -j BOARD=${{ matrix.board }} HDMI_CONSOLE=1
+      run: |
+        make clean
+        if [ "${{ matrix.board }}" == "cm4-64" ]; then
+          make -j BOARD=pi4-64 USE_EMMC=1 HDMI_CONSOLE=1
+          mv kernel8-rpi4.img kernel8-rpi4-emmc.img
+        else
+          make -j BOARD=${{ matrix.board }} HDMI_CONSOLE=1
+        fi
 
     - name: Upload built kernel
       uses: actions/upload-artifact@v3

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- eMMC-enabled kernel for the non-"lite" version of the Compute Module 4. This is a separate specially-built kernel that you must manually opt into; there is currently no way to automatically detect "lite" versus "non-lite" CM4s.
+  * To use this kernel, you must manually rename `kernel8-rpi4-emmc.img` to `kernel8-rpi4.img` (replacing the default Pi 4/CM4 "Lite" compatible kernel).
+
 ### Fixed
 
 - Memory corruption/crashing caused by faulty ring buffer dequeue implementation.

Config.mk

@@ -18,6 +18,9 @@ USERBAUD?=115200
 # Enable section garbage collection
 GC_SECTIONS?=1
 
+# Enable on-board eMMC for non-"lite" Compute Module models
+USE_EMMC?=0
+
 # Toolchain setup
 ifeq ($(BOARD), pi2)
 RASPBERRYPI=2

Makefile

@@ -54,6 +54,11 @@ endif
 # Enable PWM audio output on GPIO 12/13 for the Pi Zero 2 W
 	@echo "DEFINE += -DUSE_PWM_AUDIO_ON_ZERO" >> $(CIRCLE_CONFIG)
 
+ifeq ($(strip $(USE_EMMC)),1)
+# Enable eMMC for non-lite Compute Module
+	@echo "DEFINE += -DUSE_EMBEDDED_MMC_CM" >> $(CIRCLE_CONFIG)
+endif
+
 #
 # Build circle-stdlib
 #